i have no idea with these. i need it to power
intel i5-750@2.7GHz
GeForce 250GTS (and certainly something better in the future)
2 SATA drives
1 SATA CD/DVD unit
4 fans (maybe more in future)
intel dh57dd motherboard
one of the above RAM unnits + 2x2GB i already have inside

Now where did you get that from? If you mean on clocks then I can understand but it should run with it.

Pock if you have HyperX then its the best to buy identical ram sticks and dont go with other manufacturer or model.

So HyperX is Kingston but you need to know which ones exactly ( CAS latency - 9-9-9-24-2T etc. ) and then go buy new ones. Of course slighly different latencies wont hurt but as long as its same density or manufacturer.

CATA4TW!

"People never lie so much as before an election, during a war, or after a hunt."

"God has a special providence for fools, drunks, and the United States of America."
― Otto von Bismarck